Irwin 53635 5 Piece Straight Screw Extractor Assortment for Removing Screws and Bolts 3/16-Inch to 5/8-Inch and 5-Millimeter to 16-Millimeter This IRWIN screw extractor set is designed for softer materials or thin-walled pieces These screw extractors ease extraction by not expanding the material as it is removed Each screw extractor has the size and recommended drill bit size etched onto it Removes both left-hand and right-hand threaded parts Screw extractor set includes ST-1 to ST-5 pieces Contains sizes ST-1 through ST-5 For removing broken screws, studs, and bolts in soft materials, or thin-walled pieces Straight tapered flute will not expand piece being removed Correct drill size stamped on each screw extractor Removes broken piece without damage to threads